Core-box for pistons



'EQ W; CLARK.

CORE BOX FOR PISTONS.

APPLICATION FILED AUG. 19. 1920.

1,37,52,45 Patented May 17,1921.

2 SHEEIS-SHEETK.

LH IL] E. W. CL-ARK.

CORE BOX FOR PISTONS.

A'PYPL-IICATION FILED we. 19., 1920.

1323524., Patented y 17, 1921.

2 SHEETS-SHEET Z. 1 1

Q K 1 I A Q I l lll I l llll EV 14 UNITED STATES.

EDWARD w. orm, or LOS memes, CALIFORNIA,"ASSIGNOR or oNn-roun'ru'roPATENT ()FFICE.

.vIonEr n. women, ALL or LOS ANGELES, camronmn.

To'oll'whomit may concern: v Be it known that I, EDWARD W. CLARK, acitizen-of theUnited States, and a resident of Los Angeles, in thecounty of Los Angeles,State of California, haveinvented new and useful:Improvements'in Core-Boxes for Pistons, cations...

Myv invention-relates to core. boxes for castingv integral l'pistons, of.the character used in internalrc'oinbustion engines, and the mainobject is to provide a core box especially adapted for making cores forplstons havinginternally formed spiral ribs extending downwardly in thepistonfrom the inner snrface of the head to points substantially belowthe pin bosses, for the purpose of reinforcing theheadand walls of the pstons so that a'minimum thickness of metal may movement thereof atcertain speeds.

- this-application, to other types of coreboxes fbrp1stons of myinvention, described in two' applications for, Letters PatentffiledJune-130, 1919, [Seri'al No. 309,230; and iii "jects byimeans "of themechanism .s the accompanyingdraw ,ngs,jormin of this "applicatiomandfended,"

which 'a-singl e-pra'ctica'li H v -:trated, subject tofimaterial 'modi Ichange,- sw'ithoutjdeparting fro th .s'pi'rit of my invention orenlarging its scope 'beyond that ofthe appended claims.

:In'said drawings: ,7

qFigure 1;,isa side elevation, partly in sec-. tion of my. improved corebe; mounted upon afisuitable base, with the rib formin members'gshown attheir lower extreme 0 movement in inoperative position; 7

.hsh th'e above andloth'e'r e1 1'1 Fig. 2,.is a sectional elevationofthe same,

' arming members in operative p v plates abut an annular rib ,A-on theupperside of the member 7 and the upper ends withthe rib f position.

Fig. 3 is, tion of Fig. 1 on line I Fig. 4 is a section of Fig. 2 online Fig. 5 is a sectionalv elevation of the body members in closedposition center of the pin bosses.- v y Fig. 6 isja sectional plan ofFig. 5 on line M6. V

\ cone-Box r03 Herons;

specification of Letters Patent. Application flled August 19, 1920..Serial in. 404,075.

of which the following is a specifi be provided in said head andfwalls,thereby substantially reducing the weight of the. pistons inthe enginecylinders and thus cor-W respondingly reducing vibration, due to the andthrough the, p

" The head ma sk, showing the slots therein, for lng the ribforming'plates. j

ig. 8 is asection ofthe'sam'e.

. Fig.- 9 is an elevation, partly ini'sectiomof a piston produced bymeanjsiof my improved core box.

by my core box I In said drawings, B and'B' represent like bodmembers-having ,main .body moldin wal s'W and W, respeetively,jcorresponing core print'molding portions Pfland'P',

and diametrically opposite bosses 2-, 2, ha'vf- Fi .'7 is'a plan view ofthe sup g d iindg ,ig. 10 is an elevation of a: core produced bodymembers whichseparate at the center ing bores 12 and bf. Withinfsaidbodymeme, hers is a central bore lfi'n which the core ofsand or the .like'isadapted toj be formed.

' The body of the core box is adapted tobe positioned as shown-; inthedrawings, with the core e'print molding. portions at the top,"

the lower endof said body ha'ving an opening 3 therein whichisfadapted'to movabg receive a circular head niolding member and theupper end of the bodyha's an annular internal head, or rib r fforined'thereon the e n ribpn-th end of use on-a base4 having a: stein S"removably ri f asst screw 6o'r otherwise,

plurality of radiallyformed slots 8, 8, etc,,

which formsa'corresponding jrecess onthe periphery of Bjo'd '.isstationarrly fmountedfor};

7 fheldin sweet on the-upper portion of said' "-.baseb'y nd adish. "endoflfS aidst 14158 I c rried. on the uppef ,mithe body members b Suitablyattach said s i yTfi eans' of therein i and adaptedto receiveand holdSI/ 35 pglurality of spirally formed molding plates R, etc. which extendupwardly from portion 7 in spiral leads and are 'of a maximum width attheir lower portions 9 anda minimum width at their. upper ends 10.,Said, 7

thereof, when in molding position, abut the annular rib 1' of the body,as shown in the stem S by means of which the rib recess molding elementsmay operative position shown n tive position shown in- Fig lockingdevice for holding the head at its u per extreme of movement mayinclude. a-

unger 11. adapted to seat at its mner end 12 in a suitable notch in thestem, and a sprin 13 carried on said plunger-and atplunger 11 for eplates order to move the head relative to the body v the body. Likewise,

- ends 17 a pair or more of 23, on member B.

it will be obviouslmecessary that. the lower portion 14 of. the y-'wh1chis of less di ameter than the upper portion in order that extrathickness at the top of the piston where the piston ring ooves tomovably receive the head is moved into operative thereon for movablyreceiving a the inner 18 carried on the extension The lead of the platesP, the slots 15 and the grooves 16 corres nd, so as to im tion to t ehead H and dp said members are move stem S b means of the extension E,in a manner similar to themovement of a nut on a screw, except that thelead of the ves is substantially. less than that of t e threads on ascrew.

It will be clearly understood from a consideration of the drawings thatthe plates R form corresponding recesses R in the periphery of members Pates B when the and P form a core print P? on said core; a reducedportion 14" is provided .on the op posite end of the core from saidprint for providing additional thickness of metal at points 0 posits thering grooves in the iston; an the endof the core is rovid with anannular rib recess A, ormed by the annular rib A on the head H.Removable pins 20, 20, are provided for insertion in thebores b and b ofbosses 2, 2,

and are adapted to extend inwardly into the bore of the bod for formi igpin boss recesses 2', 2' in t e core C. e body members B and B may beheld in proper position by means of dowels 21, held in lugs 22, onmember B and seating in similar lugs the use of the core The pistonproduced b has a cad H with rela- C just described tively thin walls ingportion 14", a central annular rib or on the inner side of the head, 0posite in bosses 20', a series of spiral ri s R", etc., and an annularrib 1'" at the end of the skirt, as shown in Fig. 9.

naraeee ni oved fromin- A ig. 1 to opera- 2.- A suitable v i the coreand the reakin B being spirally formed' in metal may be provided.

' core, after which the core may be removed for v are formed, shouldhave a series o spiralslots 15, 15, etc. formed therein plates P whenthe ition in the stem S" ay. a pair,-;

and a relatively mot-ab or more, of spiral grooves 16,16, termed;

Qtherein including Ila plurality of spirally .formed plates, foriforn'iin corresponding set screws, or'pins art a rotary moupwardly onthe .body members, and relatively means insertible therein,

the .core C; the print molding 24 and ring groove carryuse, and aninternal moldi In the o eration of the core box, it will be understoothat when a core has been formed therein and has set for a sufficientlength of time to hold together, the plunger 11" may .bereleased' fromthe stem S so as to lower the R. into the position shown in movementbeing rotary and plates R are stripped from the core in such a manner asto revent the collapsing of.

head H and rib forming plates Fig. 1.

ticles of sand at' the n recesses. I thej'plates B have been completelywith drawn from the mold, the'bod members .13

Such.. downward, the" away ofthe ar-j ,en.

[and B are then separatedan moved hori-i zontall away fromjthe coreso'as to with? draw t e pins 20 fromtheirreoesses in the:

use in a castingoperation-for producing istons of the character shownand descri d; WhatI'claim,is: '1. A core box' havin" ememberin'j's'ertib e recesses in the 'core'produce thereby.

a stationary body, v

2. A core boxfhaving a body, 'and'a relatively movable member thereinfor forming.

spiral recesses in theperiph'eryof the corev produced thereb 3. A corebox aving separable body members and relatively movab e meansinsertible' therein for formin spiral re e in g ,C re produced there y.

4. A'fcorebox having laterally separable for forming.

spiral recesses in the core produced thereby. 5. A core box having abody molding po1 V tion, and relatively rotatable means insertibletherein forforming spiral recesses in the" core produced thereby.

6. A core rotatable means for formingespiral retively cesses in the"core and ads. ted to inserted said body.

7. A core box having a set ofseparable body members capable ofseparation and atf tachment horizontally, and relatively rotatable meansfor formm spiral recesses in the core and adapted to moved lonitudinally for insertion in and withdrawa from core and the other memberhaving corresponding guideways therefor.

9. Acore box having a fixed bod molding member, means for supporting saibody for rotatably and slidablyhel on said supports mg means, as and forthe purpose described. 10. A core box having main molding box having abody, and rela-' member therefor p 100 movable f no" and withdrawn froman longitudinally of 1 members,- anda member insertible therein having aplurality of spiral plates for forming corresponding recesses-in thecore.

11. A core box having a body molding means, and relatively adjustablerecess molding means including a plurality of spiral plates commonlymounted and movable together to and from operative position in said bodymolding means.

12. A core box including an adjustable r0- tary member having aplurality of spiral recess forming elements held thereon, for thepurpose described.

13. A core box including a molding member having a plurality of spiralrecess molding elements, and means for guiding said member into and fromoperative position.

14:. A core box including a body molding means, and combined head. andrecess mol ding means having a plurality of spiral members, and'means insaid body molding means for receiving said spiral members.

15. A core box including a supporting structure, a body molding meansheld thereon, and relatively movable head and recess forming meansmovable on said support and including a plurality of spiral recessformmg members, as described.

16. A core box including relatively stationary and movable moldingmembers, oneof said members forming body molding means and the othermember forming recesses in the core and having a series of spiral recessmolding members adjustable relative to said'body.

17 A core box including separable body molding means, pin boss moldingmembers detachably held in said body, a core. print molding memberintegral with said body, a head molding member movable in and forming aclosure for said body, and a series of spiral molding members carried onsaid head for forming recesses in the core.

18. A core box having relatively adjustable head and body moldingmembers, spiral 'means for advancing and retracting said head relativeto said body, and a series of spiral members movable with said head, forforming corresponding recesses in the core. 19. A core box includinghorizontally movable body members, and a longitudinally movable meanslongitudinally adjustable relative thereto and including spiral recessforming elements, for the purpose described.

20. A core box having horizontally separable body molding members, afixed support therefor, and longitudinally movable means rotatable onsaid support When advanced and retracted relative to said body members,for forming spiral recesses in the core.

. EDWARD W. CLARK. Witnesses:

PAUL Amswon'rn, LUTHER L. MACK.

